Thermostatically-operated electric switch



Nov. 23 1926.

G. K. CULP, JR., ET- AL THERMOSTATICALLY OPERA-TED ELECTRIC SWITCH Original Filed Nov. 26, v1924 Www w ma@ A TTORNE Y.

' l Patented Nov. 23, 1926.

UNITED. STATES A asians PATENT GEDRGE K. CULP, JB., GALEN D. BARKER, AND WILLIAM J'. STURGIS, OF DOWAGIAC, MICHIGAN', ASSIGNOBS TO THE ELEQTROMATIC APPLIANCE CORP., A CORPORA- THERMOSTATICALLY-OPERATED ELECTRIC SWITCH.

Original application led November 26, 1924, Serial No. 752,429. Divided and this application filed october i4,- 1925;

The present invention relates tothermostatically operated electric switches, and its object is, generally,to provide a switch, or circuit opener and closer, for electric c ircuits, improved in various respects hereinafter appearing; and more particularly, to provide an electric switch controlled by' a thermostatic bar .so formed' as to exert its operating force in an approximately direct line; and further, to provide means for controlling such a switch, which shallact with equal promptness inthe various positions in which the parts of the device may be:

These and any other objects hereinafter appearing are-attained by, and the invention finds preferable embodiment in, the structure hereinafter particularly described 1n the body of this specication and illustrated by the accompanying drawing 'showing in perspective an electric switch and controllingl means therefor, certain .parts being broken away.

The thermostat-ic bar 1 is mounted at 2 inside a chamber 3 to which heated air or pipe 4 and may pass out through the vent 5 to the pipe 6 and its continuing pipe 6 which may be provided with a rotatable sleeve valve 20. As the air or other gas in 'this chamber 3 becomes. heated, or as heated air or gas is admitted thereinto, the thermostatic bar v1 is flexed, carrying its free end 8 downwardly. The link 9 connects this thermostatic bar and the lever arm 10 pivotally mounted at'll and carrying the upper contact point 12 of a switch or circuit closer and opener in the electric circuit indicated at 13, 13, the link 9 being pivoted at 14 on said arm. The lower contact point 15 of said switch is carried by a lever arm 16 pivotally mounted at .17 and having a, slight swinging movement at its contact point-carrying en d relatively vto the arm 10, such relative movement being limited by said upper contact point 12 and by the ledge 18 of the arm 10 underlying the lateral extension 19 of the arm 16. The swinging' movement of the arm 16 is braked oririctionallv resisted by its spring portion pressed yieldin l by a spring 21 whose tension is ad]usta. le by the nut 22, against the post 23 on which this arm is pivoted at 24. It will be seen that as the lever arm 10 swings upwardly other gas maybe admitted from the intake.

'Serial No. 62,344.

Vunder the action of the cooling thermostatic bar 1, the switch is opened and the lever arm 16 is thereupon swung upwardly by the ledge 18 engaging the extension 19; but as the heated thermostatic bar swings the lever arm 10 downwardly, the-switch is quickly closed in whatever swung position these-lever arms may be at the time the downward movement of the arm 10 begins. lever arms 10 and 16 are thus always carried so nearly together that theoperation of the thermostatic bar to control the.I switch is equally prompt in` any position' to which these lever arms may be swung. The lever arm 16 may be counterbalanced at 26 as shown. This switch may be thus operated by any means .adapted to swing the lever arm 10 as well as by the thermostatic bar'lj.

l In order that the force exerted by the thermostatic bar in operating the switch may be exerted as nearly as ma be in one direct line, i. e., so that the lin 9 may be moved laterally as slightly as possible to permit of `its slidingly fitting as 'tightly as may be in the opening 27 through which it extends, and thus to confine the air or as in the chamber 3 as completely as possib e, the free end 8 of the thermostatic bar extends up wardly, as shown, so that, as said bar lexes and therefore shortens, its said free end may beinclined further outwardly, to thus maintain practically constant the distance between 4the thermostatic bars mounting point 2 and the point at its free end 8 to which the link 9 is connected.

Furthermore: In order that the chamber 3 may confine the heated air or gas as completely as possible,the opening 27 through which the link 9 extendsl is covered by a disk 2 8 lying on the upper surface of the apparatus and` having an opening 29 through `which said link extends and in which it slidably fits. slightly onsaid surface'with any slight lateral movement of this link occasioned by the swinging of the leverV arm 10 on the thermostatic bar 1. -This invention is described and illustrated in our application Serial Number 7 52,429, tiled November 26, 1924, but notclaimed therein.

The invention being intended to be pointed out in the claims, is not to be limited to or by'details'o construction of the particu- The two This disk is adapted to slide.

lar embodiment thereof illustrated by the drawings or hereinbefore described.

. We claim:

1. In a device of the character described:

.a chamber adapted to contain heated air; a

- and having a swingable arm; 'a link freelyswingably connected to the arm and to the free end portion of the bar adjacent its outer extremity and extending' through an o pening inthe Wall ofthe chamber.

2. In a device of the character described:

an electric switchcomprising a' pair ot swingably mounted arms carrying the con-v .tacts points respectivelyofthe switch yand having a swinging movement relatively tol each other .limited in one direction the contacting of said points and in the" other direction by mutually abutting portions of' the lever arms and either of said arms being movable with the other in one direction by the contacting of saidv points and in the other direction by the mutually abutting portions of the lever arms.

3. In a device of. the character described: an electric switch comprising a pair of swingably mounted arms carrying the contact points respectively of the switch and having a swinging movement relatively .to each other, limited in one directiony by the contacting of said points and in the other diection by mutually abutting portions of thc lever arms and either of said arms being movable with the other in onedirection by the contacting of said points and in they other direction by the mutually abutting portions of the lever arms; a thermostatic bar; connections bet-ween said bar and one of said armsl for swinging the same by the flexing of said bar.

In testimony whereof We have hereunto set 

